Australian Grand Prix rider Casey Stoner has admitted his chances of winning the 125cc world championship have been destroyed by his second-lap crash in the Czech Republic GP nine days ago.

Stoner admits Czech crash has put paid to title hopes

Australian Grand Prix rider Casey Stoner has admitted his chances of winning the 125cc world championship have been destroyed by his second-lap crash in the Czech Republic GP nine days ago.

The 18-year-old missed the previous two rounds of the championship after breaking his collarbone in practice for the British GP at Donington, and returned to Australia to allow the break to heal naturally rather than have surgery to pin it together.

But at Brno he was desperately chasing breakaway leader Andrea Dovizioso to try to prevent a repeat of the Italian's clear victory at Donington.

Stoner acknowledged last week that he perhaps had been pushing a little too hard when he lost control of his KTM, a mistake that would eventually leave him 79 points adrift of Dovizioso in the championship with 150 points left to fight for.

"It showed on the telemetry that I didn't go into that corner any harder than the lap before and I had crashed in the warm-up in a similar way. The front went without any warning," Stoner is quoted as saying on the official MotoGP website.

"It was quite strange and another little bit of bad luck. I could have been pushing a bit hard but I felt comfortable. It's just disappointing. The fact I didn't hurt myself almost makes it more annoying -- it was just the smallest crash ever.

"It's disheartened me a little bit because the season really is destroyed now, so I'm just going to have to see what I can scramble back for the top three positions now. Even then those positions will be hard . . ."

The next round of the world championships will be in Portugal on September 12.